MANILA, Philippines (AP) _ A single-engine airplane crashed in a mountain area on its way to Clark Air Base, killing four American passengers, including the pilot, officials said Monday.

The Grumman Tiger plane crashed at noon Sunday in the municipality of La Trinidad in Benguet province, 130 miles north of Manila, said Joey Reyes of the Manila Rescue Coordinating Center.

American base authorities identified the victims as U.S. Air Force Maj. Wayne C. Voudreaux, the plane's pilot; Capt. George W. Kennedy; Kennedy's wife, Sam Nyo Pak; and their daughter, Patricia. No hometowns were immediately available.

Reyes said the cause of the accident could not be determined immediately but that the private plane, owned by a sports club at Clark, was reported missing hours after it took off from Baguio City, 50 miles north of Clark.

American and Filipino rescuers found the wreckage at about 1 a.m. Monday in a wooded area, Reyes said.